JPWO2020208474A5

JPWO2020208474A5 -

Info

Publication number: JPWO2020208474A5
Application number: JP2021513026A
Authority: JP
Filing date: 2020-04-01
Publication date: 2023-03-14
Anticipated expiration: 2040-04-01

Claims

Having a first electrode, a first light emitting layer, a first layer, a second layer, a third layer, a second light emitting layer, and a second electrode stacked in this order,
the first layer includes a first organic compound and a first substance;
The second layer has a second organic compound,
the third layer comprises a second material;
the first organic compound is an electron-transporting material,
the first substance is a metal, a metal salt, a metal oxide, or an organometallic salt;
the second organic compound is an electron-transporting material,
the second substance is an electron-injecting material;
the second layer has a lower concentration of the first substance than the first layer;
A light emitting device , wherein the first material and the second material are different materials .

In claim 1,
A light-emitting device, wherein the second layer does not include the first material.

In claim 1 or 2,
The light-emitting device, wherein the first organic compound and the second organic compound are the same organic compound.

In any one of claims 1 to 3,
The third layer further comprises a third organic compound,
The light-emitting device, wherein the third organic compound is an electron-transporting material.

In claim 4,
The light-emitting device, wherein the third organic compound is the same organic compound as at least one of the first organic compound and the second organic compound.

In any one of claims 1 to 5,
The light emitting device, wherein the first substance is an organometallic complex comprising an alkali metal or an alkaline earth metal.

In any one of claims 1 to 6,
The light-emitting device, wherein the first substance is an organometallic complex having a ligand having nitrogen and oxygen and an alkali metal or alkaline earth metal.

In any one of claims 1 to 7,
The light-emitting device, wherein the first substance is an organometallic complex having a quinolinol ligand and an alkali metal or alkaline earth metal.

In any one of claims 1 to 8,
A light emitting device, wherein the second material comprises an alkali metal, an alkaline earth metal, or a rare earth metal.

In any one of claims 1 to 9,
The first organic compound has a HOMO level of −6.0 eV or more and an electron mobility of 1×10 ⁻⁷ cm ² /Vs or more at a square root of an electric field intensity [V/cm] of 600. ^-5 cm ² /Vs or less, a light emitting device.

In any one of claims 1 to 10,
the first layer has a first region on the first light-emitting layer side and a second region on the second light-emitting layer side;
The light-emitting device, wherein the first region and the second region have different concentration ratios of the first organic compound and the first substance.

In any one of claims 1 to 10,
the first layer has a first region on the first light-emitting layer side and a second region on the second light-emitting layer side;
The light emitting device, wherein the second region has a lower concentration of the first material than the first region.

In any one of claims 1 to 12,
Furthermore, having a hole injection layer,
the hole injection layer is located between the first electrode and the first light-emitting layer;
The hole injection layer has a first compound and a second compound,
The first compound has an electron-accepting property with respect to the second compound,
The light-emitting device, wherein the second compound has a HOMO level of −5.7 eV or more and −5.4 eV or less.

In claim 13,
Furthermore, having a first hole transport layer,
the first hole-transporting layer is located between the hole-injecting layer and the first light-emitting layer;
The first hole transport layer has a third compound,
The HOMO level of the third compound is a value equal to or lower than the HOMO level of the second compound,
The light-emitting device, wherein the difference between the HOMO level of the third compound and the HOMO level of the second compound is within 0.2 eV.

In claim 14,
A light-emitting device, wherein the second compound and the third compound each have at least one of a carbazole skeleton, a dibenzofuran skeleton, a dibenzothiophene skeleton, and an anthracene skeleton.

In claim 14,
Furthermore, having a second hole transport layer,
the second hole-transporting layer is located between the first hole-transporting layer and the first light-emitting layer;
The second hole transport layer has a fourth compound,
A light-emitting device, wherein the HOMO level of the fourth compound is lower than the HOMO level of the third compound.

In claim 16,
A light-emitting device, wherein the second compound, the third compound, and the fourth compound each have at least one of a carbazole skeleton, a dibenzofuran skeleton, a dibenzothiophene skeleton, and an anthracene skeleton.

In any one of claims 1 to 17,
A light-emitting device, wherein the first light-emitting layer comprises a light-emitting material that emits blue light.

In any one of claims 1 to 18,
A light-emitting device, wherein the first light-emitting layer comprises a fluorescent light-emitting material that emits blue light.

A light emitting device according to any one of claims 1 to 19;
A light emitting device, comprising at least one of a transistor and a substrate.

a light emitting device according to claim 20;
A light emitting module, comprising at least one of a connector and an integrated circuit.

a light emitting module according to claim 21;
An electronic device, comprising at least one of an antenna, a battery, a housing, a camera, a speaker, a microphone, and an operation button.

A light emitting device according to any one of claims 1 to 19;
A lighting device comprising at least one of a housing, a cover, and a support base.